by Kirov, KI, Ivanov, NA, Atanasova, ED, Minchev, GM
Published in Vacuum (1976)

by Kirov, K.I., Atanasova, E.D., Ivanov, N.A.
Published in Thin solid films (01.03.1977)

by Kirov, KI, Georgiev, SS, Ivanov, NA, Minchev, GM
Published in Vacuum (01.01.1978)

by Kirov, K.I., Atanasova, E.D., Alexandrova, S.P., Amov, B.G., Djakov, A.E.
Published in Thin solid films (01.01.1978)

by Kirov, K.I., Georgiev, S.S., Pantchev, B.G., Koprinarova, J.B.
Published in Thin solid films (01.01.1980)